1
PS7027F 09/09/04
Features
Near-Zero propagation delay
5 switches connect inputs to outputs
Direct bus connection when switches are ON
Ultra-low quiescent power 32X384 (0.2A typical)
Ideally suited for notebook applications
Packaging (Pb-free & Green Available):
48-pin 150-mil wide plastic BQSOP (B)
48-pin 240-mil wide plastic TSSOP (A)
PI5C32X384/32X384C
20-Bit, 2-Port Bus Switch
Block Diagram
Pin Configuration
Pin Description
Pin Name
Description
BE
X
Bus Enable Inputs (Active LOW)
A
19
-A
0
Bus A
B
19
-B
0
Bus B
GND
Ground
V
CC
Power
Description
Pericom Semiconductor's PI5C32X384 and PI5C32X384C are
20-bit bus switches designed with a low On-Resistance allowing
inputs to be connected directly to outputs. The bus switch creates no
additional propagational delay or additional ground bounce noise.
The switches are turned ON by the Bus Enable (BE) input signal.
Four bus enable signals are provided, one for each of the upper
and lower five bits of the two 10-bit buses.
BE
B
BE
A
A
19
A
15
B
19
B
15
A
4
A
0
B
4
B
0
BE
D
BE
C
A
14
A
10
B
14
B
10
A
9
A
5
B
9
B
5
BE
A
B
0
A
0
A
1
B
1
B
2
A
2
A
3
B
3
B
4
A
4
GND
BE
C
B
5
A
5
A
6
B
6
B
7
A
7
A
8
B
8
B
9
A
9
GND
V
CC
B
19
A
19
A
18
B
18
B
17
A
17
A
16
B
16
B
15
A
15
BE
B
V
CC
B
14
A
14
A
13
B
13
B
12
A
12
A
11
B
11
B
10
A
10
BE
D
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
PI5C32X384/PI5C32X384C
20-Bit, 2-Port Bus Switch
2
PS7027F 09/09/04
Storage Temperature .............................................................65C to +150C
Ambient Temperature with Power Applied ............................40C to +85C
Supply Voltage to Ground Potential (Inputs & Vcc Only) ......0.5V to +7.0V
Supply Voltage to Ground Potential (Outputs & D/O Only) ...0.5V to +7.0V
DC Input Voltage .....................................................................0.5V to +7.0V
DC Output Current................................................................................120mA
Power Dissipation ....................................................................................0.5W
Note:
Stresses greater than those listed under MAXIMUM RAT-
INGS may cause permanent damage to the device. This is
a stress rating only and functional operation of the device
at these or any other conditions above those indicated in
the operational sections of this specification is not implied.
Exposure to absolute maximum rating conditions for ex-
tended periods may affect reliability.
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
DC Electrical Characteristics
(Over the Operating Range, T
A
= 40C to +85C, V
CC
= 5V 5%)
Parameters
Description
Test Condidtions
(1)
Min.
Typ.
(2)
Max. Units
V
IH
Input HIGH Voltage
Guaranteed Logic HIGH Level
2.0
-
-
V
V
IL
Input LOW Voltage
Guaranteed Logic LOW Level
-
-
0.8
I
IH
Input HIGH Current
V
CC
= Max., V
IN
= V
CC
-
-
1
mA
I
IL
Input LOW Current
V
CC
= Max., V
IN
= GND
-
-
1
I
OZH
High Impedance Output Current
0 (A, B) (C, D) V
CC
-
-
1
I
OS
Short Circut Current
(3)
A,B (C, D) = 0V, C, D (A, B) = V
CC
-
300
-
mV
V
H
Input Hysteresis at Control Pins
V
CC
= Min., V
IN
= 0.0V, I
ON
= 48mA
-
5
7
R
ON
Switch On-Resistance
(4)
V
CC
= Min., V
IN
= 2.4V, I
ON
= 15mA
-
10
15
Note:
1. H = High Voltage Level
L = Low Voltage Level
Hi-Z = High Impedance
Truth Table
(1)
Function
BEA
BEB
B4-B0
B19-B15
Disconnect
H
H
Hi-Z
Hi-Z
Connect
L
H
A4-A0
Hi-Z
Connect
H
L
Hi-Z
A19-A15
Connect
L
L
A4-A0
A19-A15
Function
BEC
BED
B9-B5
B14-B10
Disconnect
H
H
Hi-Z
Hi-Z
Connect
L
H
A9-A5
Hi-Z
Connect
H
L
Hi-Z
A14-A10
Connect
L
L
A9-A5
A14-A10
PI5C32X384/PI5C32X384C
20-Bit, 2-Port Bus Switch
3
PS7027F 09/09/04
Parameters
Description
Test Condidtions
(1)
Min. Typ.
(2)
Max. Units
I
CC
Quiescent Power Sup-
ply Current
V
CC
= Max.
V
IN
= GND
or V
CC
PI5C32X384C
PI5C32X384
60
0.1
200
3.0
A
I
CC
Supply Current per
Input @ TTL HIGH
V
CC
= Max.
2.5
mA
I
CCD
Supply Current per
Input per MHz
(4)
V
CC
= Max.,
A and B Pins Open
BE1 or BE2 = GND
Control Input Toggling
50% Duty Cycle
0.25
mA/
MHz
Notes:
1. For Max. or Min. conditons, use appropriate value specified under Electrical Characteristics for the applicable device.
2. Typical values are at V
CC
= 5.0V, +25C ambient.
3. Per TTL driven input (V
IN
= 3.4V, control inputs only); A and B pins do not contribute to I
CC
.
4. This current applies to the control inputs only and represent the current required to switch internal capacitance at the specified frequency. The
A and B inputs generate no significant AC or DC currents as they transition. This parameter is not tested, but is guaranteed by design.
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at V
CC
= 5.0V, T
A
= 25C ambient and maximum loading.
3. Not more than one output should be shorted at one time. Duration of the test should not exceed one second.
4. Measured by the voltage drop between AB and CD pin at indicated current through the switch. On-Resistance is determined
by the lower of the voltages on the two (A or B, C or D) pins.
5. This parameter is determined by device characterization but is not production tested.
Capacitance
(T
A
= 25C, f = 1 MHz)
Parameters
(5)
Descritption
Test Condidtions
Type
Max.
Units
C
IN
Input Capacitance
V
IN
= 0V
-
6
pF
C
OFF
A/B Capacitance, Switch OFF
V
IN
= 0V
-
6
C
ON
A/B Capacitance, Switch On
V
IN
= 0V
-
8
Power Supply Characteristics
PI5C32X384/PI5C32X384C
20-Bit, 2-Port Bus Switch
4
PS7027F 09/09/04
Package Mechanical: 48-pin TSSOP (A)
.236
.244
.488
.496
.002
.006
SEATING PLANE
.007
.010
.0197
BSC
.004
.008
.319
1
48
12.4
12.6
6.0
6.2
0.50
0.17
0.27
8.1
0.05
0.15
0.09
0.20
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
.018
.030
0.45
0.75
.047
1.20 Max
BSC
Switching Characteristics over Operating Range
Parameters
Description
Conditions
(1)
PI5C32X384/PI5C32X384C
Units
Min.
Typ.
Max.
t
PLH
t
PHL
Propagation Delay
(2,3)
A
x
to B
x
, B
x
to A
x
C
L
= 50 pF,
R
L
= 500
-
0.25
-
ns
t
PZH
t
PZL
Bus Enable Time BE
x
to A
x
or B
x
1.5
-
6.5
t
PHZ
t
PLZ
Bus Disable Time BE
x
to A
x
or B
x
1.5
-
5.5
Notes:
1. See test circuit and waveforms.
2. This parameter is guaranteed but not tested on Propagation Delays.
3. The bus switch contributes no propagational delay other than the RC delay of the On-Resistance of the switch and the load capacitance. The
time constant for the switch alone is of the order of 0.25ns for 50pF load. Since this time constant is much smaller than the rise/fall times of
typical driving signals, it adds very little propagational delay to the system. Propagational delay of the bus switch when used in a system is
determined by the driving circuit on the driving side of the switch and its interaction with the load on the driven side.
PI5C32X384/PI5C32X384C
20-Bit, 2-Port Bus Switch
5
PS7027F 09/09/04
Pericom Semiconductor Corporation 1-800-435-2336 www.pericom.com
Ordering Information
Ordering Code
Package Code
Package Description
PI5C32X384B
B
48-pin 150-mil wide plastic BQSOP
PI5C32X384BE
B
Pb-free & Green, 48-pin 150-mil wide plastic BQSOP
PI5C32X384A
A
48-pin 240-mil wide plastic TSSOP
PI5C32X384AE
A
Pb-free & Green, 48-pin 240-mil wide plastic TSSOP
PI5C32X384CA
A
48-pin 240-mil wide plastic TSSOP
PI5C32X384CAE
A
Pb-free & Green, 48-pin 240-mil wide plastic TSSOP
PI5C32X384CB
B
48-pin 150-mil wide plastic BQSOP
PI5C32X384CBE
B
Pb-free & Green, 48-pin 150-mil wide plastic BQSOP
Notes:
1. Thermal characteristics can be found on the company web site at www.pericom.com/packaging/
Package Mechanical: 48-pin BQSOP (B)
.014
.0157 BSC
0.40
0.356
.008 0.20
.002
.009
5
0.05
0.25
.079
2.0
.010 0.25
Gauge Plane
.150
.157
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
3.80
4.00
.228
.244
5.80
6.20
.020
.029
0.50
0.75
.063 1.60
.015 0.381
.386
.394
9.80
10.00
.0051
.009
0.13
0.23
1
48
x 45
BSC
Nom
Max
Nom
REF
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